This is using a normal M66 block, converting it to a surge suppression block with DLT 1Pair to five Pair. The most this block will handle is four 5pairs and one 4 pair. All a technician has to do is put it on the wall, punch down his pairs, and ground the M66 block. The purpose of this device is to save the technician time on a new install with the protectors already installed. Call for prices on this M66 Block. 888-471-1038 or E-Mail me: jpecore@earthlink.net